So to start I had to re - install painter x cos when I opened a new doc I could only paint on the canvas but nothing shows on a new layer?

So after re-install I started a pic with a few layers and everything seems to work. I am using the pastel brush so I have pick-underlaying colour on (Why do they even have this? Who the fuck wants to paint with a brush that makes white 1st anyways?) So this morning i fire up painter and now one layer seems corrupt cos when I paint over another layer on top of it Im getting white? If i group and collapse the layer then I can paint over it? Very frustrating cos I want to show my process steps and like keeping the layers.

Any ideas? Freakin hate computers -